Then there arose a dispute between some of John's disciples and the Jews about purification.
John 3:25
Surrounding context
3:24 For John had not yet been thrown into prison.
3:25 Then there arose a dispute between some of John's disciples and the Jews about purification.
3:26 And they came to John and said to him, "Rabbi, He who was with you beyond the Jordan, to whom you have testified--behold, He is baptizing, and all are coming to Him!"